diff --git a/routes/web.php b/routes/web.php
index f96a05b3..53eb94e1 100644
--- a/routes/web.php
+++ b/routes/web.php
@@ -204,6 +204,10 @@ Route::get('/supplier/pi/export', function(){
         foreach ($group->transactions as $transaction){
             $booking = $purchaseOrder = $transaction->owner->owner;
             $purchaseOrder = $booking->transactions()->where('type', TransactionType::PURCHASE_ORDER)->where('status', ApprovalStatus::APPROVED)->first();
+            if(!$purchaseOrder) {
+                echo 'warning, booking ref.'.$booking->marking.' doesn\'t have purchase order';
+                continue;
+            }
             foreach ($purchaseOrder->transactionDetails as $item){
                 $i++;
                 echo '<tr>';